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13. Probability
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Q40 of 128 Page 13

It is given that in a group of 3 students, the probability of 2 students not having the same birthday is 0.992. What is the probability that the 2 students have the same birthday?

Let E be the event of 2 students having the same birthday and _E’ be the event of not getting the same birthday


Given: P(E) = 0.992


We know that, P(E) + P(E’) = 1


∴ P(E’) = 1 – P(E)


= 1 – 0.992


= 0.008


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38

From a pack of 52 playing cards Jacks, queens, kings and aces of red colour are removed. From the remaining, a card is drawn at random. Find the probability that the card drawn is

(i) a black queen


(ii) a red card


(iii) a black jack


(iv) a picture card (Jacks, queens and kings are picture cards).

39

A bag contains lemon flavoured candies only. Malini takes out one candy without looking into the bag. What is the probability that she takes out.

(i) an orange flavoured candy?


(ii) a lemon flavoured candy?

41

A bag contains 3 red balls and 5 black balls is drawn at random from the bag. What is the probability that the ball drawn is (i) red? (ii) not red?

42

A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be (i) red (ii) white (iii) not green

Questions · 128
13. Probability
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